Czech Metrology Institute  
Okružní 31,  638 00 
Brno 
1. ------IND- 2010 0348 CZ- EN- ------ 20100625 --- --- PROJET 
 The Czech Metrology Institute (CMI), as the comp etent local body for stipulating metrological and 
technical requirements for a specified measuring devi ce and for the stipulation of test methods for type 
approval and for verification of a specified measur ing device pursuant to Section 14(1) of Act No. 
505/1990 Coll., on Metrology, as amended, and pursua nt to provisions of Section 172 et seq. of Act 
No. 500/2004 Coll., the Administrative Code, as amende d (hereinafter the "AC"), has on 26 February 
2010 commenced ex officio proceed ings pursuant to Section 46 of the AC, and based on supporting 
documents issues this: 
 
I. 
M E A S U R E  O F  A  G E N E R A L  N A T U R E 
number 0111-OOP-C008-10 
reference no. 0313/001/10/Pos., 
publication date: 26 Feb. 2010 
 
stipulating metrological and technical requirements for specified measuring devices, including 
test methods for verifying specified measuring devices: 
"alcohol meters used to measure the volume of alcohol produced" 
 
1   Basic definitions 
For the purposes of this measure of a general natu re, terminology and defini tions contained in the 
VIM1) and the following apply: 
1.1   Alcohol meter: a meter intended for the measurement of  the amount of alcohol produced in 
commercial distilleries and grower distilleries, and to  which requirements of special legislation apply; 
2), 3) 
1.2   Alcohol: pure ethanol (ethyl alcohol) or a mixture of ethanol and water; 
1.3    Volume concentration of an ethanol-water mixture: the ratio of the volume of pure ethanol 
contained in a mixture at 20 °C to the total mixture volume at the same temperature; 
1.4   Mass concentration of an ethanol-water mixture: the ratio of the mass of pure ethanol con-
tained in a mixture to the total mixture mass; 
                                                      
1)   International Vocabulary of Metrology - Basi c and General Concepts and Associated Terms (VIM) 
 
2)   Act No. 61/1997 Coll., on alcohol, as amended 
3) Ministry of Finance Notice No. 150/2008 Coll., on the supervision of the production and distribution of alco-
hol and on implementing other related provisions of the act on alcohol, Section 4(1)(c). Measure of a General Nature No. 0111-OOP-C008-10 
2 1.5   Drum meter: a volume meter whose main part is a rotary  drum with a horizontal axis of rotation 
that is composed of several measuring chambers, a nd which is put into motion by the effect of the 
weight of liquid (alcohol) as individual chambers alternately fill and empty;  
1.6   Sampling apparatus: an apparatus for the automatic sampli ng and collection of samples of the 
alcohol being measured that perm it the independent determination of the average volume concentra-
tion of alcohol flow; 
1.7   Corrective apparatus: an auxiliary apparatus that corrects measured volume values according to 
alcohol flow density and temperature; 
1.8   Conversion apparatus: an auxiliary apparatus that automa tically determines the volume concen-
tration of alcohol from the measured de nsity and temperature of alcohol flow; 
1.9   Backup meter: an apparatus for measuring alcohol volume if alcohol flow rate exceeds the upper 
limit of the measurement range of a drum meter, or in case of undue drum stoppage; 
1.10    Sampling apparatus collection vessel: a vessel for the collection of alcohol samples; 
1.11   Insertion vessel: a vessel located near collection vessels th at serves to assess changes to alcohol 
concentration in collection vessels; 
1.12   Surge vessel: a vessel that captures alcohol samples if alcohol outflow is blocked; 
2   Metrological requirements 
Metrological requirements are based on the requirements of recommendation OIML R 117-1 "Dy-
namic measuring systems for liquids other than wa ter. Part 1: Metrological and technical require-
ments4)"; 
2.1   Service conditions 
Service conditions are specified by the meter manufacturer; the ambient temperature range for service 
must be at least (0 to 50) °C; 
2.2   Measurement range 
The measurement range is specified by the meter manufacturer and is given by the maximum permis-
sible alcohol flow rate through the meter; 
2.3   Maximum permissible error 
2.3.1    Maximum permissible flow volume error 
Maximum permissible flow volume errors for alcohol drum meters is given in Table 1 by meter size 
                                                      
4)   OIML R 117-1 „Dynamic measuring systems for liquids other than water. Part 1: Metrological and technical 
requirements“ – available to the public at  www.oiml.org Measure of a General Nature No. 0111-OOP-C008-10 
3 Table 1 – Maximum permissible flow volume error 
Meter type Flow 
dm3/min Maximum permissible error  
% 
Meters with drum capacity less 
than or equal to 4 dm3  
(low-capacity meters) up to 1 
1 to 2 
above 2 ± 0.2 
± 0.25 
± 0.3 
meters with drum capacity 
greater than 4 dm3  
(high-capacity meters) up to 5 
5 to 10 
above 10 ± 0.2 
± 0.25 ± 0.3 
backup meters – ± 0.3 
 
2.3.2    Maximum permissible volume errors of structural elements 
2.3.2.1    The difference between the largest and smallest  chamber in terms of nominal drum chamber 
volume must not exceed ± 0.2 %; 
2.3.2.2   The error of n volumes of sampling apparatus dippers must be smaller than ± 10 % of the n-
multiple of the nominal volume of one sampling apparatus dipper, where n is the number of drum 
chambers; 
2.3.2.3   The volume error of collection vessels must be less than ± 5 %. Volume error of insertion 
vessels must be smaller than -5 %. Volume erro r of surge vessels must be less than -2.5 %; 
2.3.3    Maximum permissible errors for measuring system elements 
2.3.3.1   The peak thermometer for indication that the permissible temperature range has been ex-
ceeded must have an error of less than ± 1 %; 
2.3.3.2    The maximum permissible error of a connected  temperature sensor/transducer is ± 0.3 °C;  
2.3.3.3    The maximum permissible error of a density sen sor/transducer for temperature conversion is 
± 3.0 kg/m3; for volume/mass conversion and vice versa, th e greatest permissible error is ± 0.6 kg/m3; 
2.4    Measuring system classification (accuracy class) 
For alcohol meters (drum type), an accuracy class of 0.5 applies; 
3   Technical requirements 
Technical requirements are based on the requirements of recommendation OIML R 117-1 "Dynamic 
measuring systems for liquids other than water. Part 1: Metrological and technical requirements4)"; 
3.1   Meter types 
An alcohol meter used to measure the volume of alcohol produced is: 
a) a drum meter with a sampling apparatus that is classified according to drum volume as: 
– meters with drum volume less than or equal to 4 dm3 (low-volume meters), 
– meters with drum volume greater than 4 dm3 (high-volume meters), 
b) a drum meter with a conversion apparatus for determining volume concentration of alcohol. Measure of a General Nature No. 0111-OOP-C008-10 
4 3.1.1   Measuring drum 
The volume of individual measuring chambers, i.e. the minimum amount measurable by the drum 
meter, must be 1 × 10n, 2 × 10n, or 5 × 10n litres, where is a positive or negative number or zero. Drum 
chambers must be equal in size and must have air relief valves. 
The axis of the drum must be horizontal when in  its operation position, and the meter must have a 
horizontal level indicator. 
The measuring drum and indicator apparatus mu st be prevented from operating in reverse. 
3.1.2   Sampling apparatus 
The ladles of the sampling apparatus that sample alcohol from the main or backup chambered drum 
must be designed in such a way that they can be  replaced with ladles of different volumes. For pur-
poses of drum balancing, ladles from each set must have the same nominal weight. 
The nominal volume of ladles is 1 cm3, 2.5 cm3 or 5 cm3. 
The sampling apparatus must have two collection vessels with sufficient bottom slope and drainage 
taps. 
An insertion vessel must be locat ed near each collection vessel. 
If the drained volume is subjected to special or sep arate treatment, the measuring apparatus must be 
configured in such a way that the drained volum e is not present in the drum meter's indication. 
3.1.3   Conversion apparatus 
The conversion apparatus automatically calculates and displays the volume concentration of alcohol in 
the flow from its density and temperature using alcoholometric tables (see OIML R 22 – International alcoholometric tables
5)) stored in its memory for a given measurement range. 
The reference temperature for alcohol measurement is 20 °C. It must be possible to calibrate the connected conversion apparatus that measures temperature and 
density. 
3.2   Display apparatus 
The display apparatus may be mechanical or electronic, and must be impossible to zero. 
One division on the meter scale must equal the volume of a measuring chamber. The maximum range of the entire display apparatus must be of the form 1 × 10
k, 2 × 10k or 5 × 10k 
units of volume, where k is a positive whole number. 
The measuring and display apparatus must be connected mechanically or with a cable. 
3.3   Auxiliary apparatus 
The measuring system includes the following auxiliary apparatus: 
– a temperature probe/transducer for determining the temperature of the measured alcohol, lo-
cated in front of the alcohol's entrance into the drum; 
– an alcohol density sensor/transducer or spirit ga uge located in front of the alcohol's entrance 
into the drum. 
                                                      
5)   OIML R 22 "International alcoholometric tables" – available to the public at  www.oiml.org Measure of a General Nature No. 0111-OOP-C008-10 
5 3.4    Failure prevention and meter safety 
3.4.1    Unacceptable opera ting conditions and failures 
A drum meter must, either via a special apparatus in cluded in the meter, prevent the occurrence of or 
using an alarm draw attention to the followi ng unacceptable operating conditions or failures: 
– flow rate exceeding the maximum permissibl e alcohol flow rate through the meter; 
– a barrier to free flow; 
– drum overflow due to a failure to rotate; 
– a temperature outside the permitted range; 
– unacceptable heating of a sample. 
3.4.2    Emergency equipment and safety features 
3.4.2.1    A high-volume meter must have a backup cham bered drum with an independent display. 
Backup meter activity must be si gnalled both visibly and audibly. 
3.4.2.2    A low-volume meter must have a visible indication of alcohol flow through the drum exceed-
ing its maximum, or in case of undue drum stoppage. 
3.4.2.3    There must be an apparatus to take off alco hol vapours at the location where the alcohol en-
ters the drum. 
3.4.2.4    The meter must have a peak thermometer to i ndicate that the highest permissible temperature 
has been exceeded. 
3.4.2.5    The meter must have a surge vessel. 
3.4.2.6    The meter must have an apparatus that preven ts air from building up in the drainage pipes. 
3.4.2.7    The housing containing all meter components must have a glass window for visual inspection 
of alcohol flow and to monitor alcohol vo lume concentration and temperature meters. 
3.4.2.8    A high-volume meter must be protected from inte ntional application of heat with a protective 
sheath that covers the meter housing except for the glass window, nameplate and main counter dis-
play. 
3.5   Material 
The meter must be manufactured from material that is  permanently alcohol resistant and is not harmful 
to health. 
Individual parts of the meter must be manufactured in such a way that deformations due to tempera-
tures within the meter's operating range that would change the measuring volume of the meter compo-
nent, and thus influence its accuracy, shall not occur. 
3.6    Power 
Meters that use an electronic conversion apparatus must be powered in a manner suitable for an explo-
sive environment in accordance with applicable regulations. 
3.7   Resistance to external influences 
Meters are only intended for measurement in buildings , i.e. in an H2 climactic environment (see also 
OIML R 117-1). Measure of a General Nature No. 0111-OOP-C008-10 
6 Meters must be rigidly fastened to their base – an M1 mechanical environment (see also OIML R 117-
1). 
3.7   Electromagnetic environment 
For meters with connected electr onic transducers and conversion apparatus, an electromagnetic class 
of E1 is defined (see also OIML R 117-1). 
3.8   Installation requirements 
To ensure meter accuracy and at the same time its  on-site verification, the following installation re-
quirements must be met: 
– the meter must be installed with the axis of  the measuring drum in a horizontal position and 
must be prevented from moving and relocation; 
– the meter must be protected from shocks and vibrations; 
– the meter outflow pipe must be located at a height that permits prescribed tests to be per-
formed; 
– the meter must be freely accessible from all sides, and must be located sufficiently far from 
sources of heat. 
3.9    Meter security and protection from fraud 
Meters must contain protective devices that can be sealed in such a manner that both before and after 
the meter's proper installation, there is no way that  the meter can be taken apart or modified without 
breaking the seal or protective devices. 
3.10   Transport and storage 
During transport and long-term storage, certain rem ovable parts must be removed, and some must be 
locked in place, according to manufacturer instructions. 
4   Meter labelling 
4.1   Meter labelling 
Meters must be clearly and visible la belled with the following information: 
– the manufacturer's name or logo; 
– the meter model; 
– serial number and year of manufacture (the serial number must also be permanently placed on 
all main and some secondary parts); 
– meter design approval label; 
– nominal drum volume; 
– nominal drum chamber volume, i.e. the minimum measurable amount; 
– maximum permissible inflow; 
– operating temperature range; 
– the counter must list the measurement unit; 
– the range of densities or volume concen trations (for conversion apparatus). 
All data, specifications, information, etc. required in the articles of this measure must be listed in the 
meter's operating manual. Measure of a General Nature No. 0111-OOP-C008-10 
7 4.2    Location of official label 
The meter must have locations prepared for official  labels. Locations for official and security labels 
are stipulated in the meter's type approval certificate. 
The location for the main official label is on the meter's nameplate. 
The meter's housing and protective sheath must be d esigned to allow the meter to be sealed off with 
valves. 
5   Meter type approval 
5.1   In general 
the type approval process for an alcohol  meter includes the following tests: 
c) external inspection; 
d) leak test; 
e) accuracy test; 
f) volume test for individual meas uring chambers of the drum; 
g) resolution test; 
h) accuracy test of the backup meter; 
i) accuracy test of structural elements; 
j) indicator check; 
k) test of the unit's conversion apparatus (if connected); 
l) a test of the resistance of the conversion appa ratus including sensors to disruptive influences 
of the surrounding environment (if connected). 
5.2   External inspection  
The following is assessed dur ing an external inspection of an alcohol meter: 
– that prescribed technical documentation is complete; 
– that metrological and technical characteristics specified by the manufacturer in documentation 
conform to requirements of this re gulation listed in sections 2 and 3; 
– that the alcohol meter is complete and in acco rdance with prescribed technical documentation; 
– that the software version of the electronic conversion apparatu s is the same as the version 
specified by the manufacturer. 
5.3   Functional tests 
5.3.1   Test equipment 
The following test equipment is used: 
a) graduated reference vessels and gr aduated cylinders of suitable volumes with an accuracy at 
least three times better than the greatest permissible error of the meter being tested; 
b) a pipette; 
c) a base for two graduated vessels with adjustable screw legs for horizontal levelling and a spirit 
level; 
d) a thermometer with 0.1 °C increments with a (0 to 50) °C measuring range; 
e) a stopwatch with 0.1 s increments; Measure of a General Nature No. 0111-OOP-C008-10 
8 f) a set of spirit gauges for a range of (0 to 100) % by volume with 0.1%, optionally also 0.2%. 
A sufficient amount of alcohol to perform the test s, with a volume concentration of around 50% for 
low-volume meters and around 90% for high-volume meters. 
5.3.2   Leak test 
A leak test is performed on the drum after it is re moved from the meter, cleaned and dried. The drum 
is suspended so that the lower chamber can be entir ely filled with alcohol. As the drum is turned, the 
individual chambers fill with alcohol. Each chamber is  tested for 5 minutes for leaks in its corners and 
walls. 
A leak test is performed 5 minutes after being filled with alcohol for: 
– the backup meter; 
– the spirit gauge reservoir connection to the meter housing. 
A leak test is performed on collection and inser tion vessels and their drainage valves when new and 
repaired meters are being tested, 3 hours after being filled with alcohol. 
If a leak is found, the meter is not subjected to further tests pursuant to this measure. 
5.3.3   Accuracy test 
An accuracy test for the meter measuring the volume of alcohol that has flowed through the measuring 
drum is performed using one of the following methods: 
– alternate filling and emptying of two graduated 20 dm3 reference vessels; 
– measurement of the amount of alcohol that has fl owed through gathered in an auxiliary metal 
barrel using reference graduated vessel s for flow rates greater than 10 dm3/min; 
– alternate filling and emptying of a double volum e apparatus whose counter directly records 
the number of measurements or the total amount that has flowed through directly. 
The following principles must be ob served when using reference vessels: 
– the reference vessel must be placed in a horizontal position; 
– the reference vessel must be pre-wetted; 
– when filling the vessel, the exact volume is set by the lowest point of the liquid meniscus 
touching the upper edge of the graduation marking, and must be read at the level of the liquid's 
surface to prevent parallax error; 
– a drip time of 30 s must be observed after the liquid has been poured out of the vessel. 
The total volume flow indicated by the meter must  not be reduced by the volume taken by the sam-
pling apparatus, and so the sampling apparatus must be disconnected during the test. 
After the alcohol outflow from the meter has been  disconnected from the fixed outflow pipe, alter-
nately fill the graduated vessels, whose nominal volum e is always adjusted after filling with a pipette. 
The number of vessels filled to their nominal volum e is recorded, as are measured volume surpluses or 
additions. 
The smallest measured amount must be e qual to ten times the volume of the drum. 
Measurement of the accuracy of volume that has flow ed through the drum must be performed at flow 
rates listed in Table 2. 
Table 2 
Flow rate (dm3/min) 
Meter 
Q1 Q2 Q3 Measure of a General Nature No. 0111-OOP-C008-10 
9 low-volume 0.5 to 1 1 to 2 2 to 3 
high-volume 3 to 5 5 to 10 10 to 15 
For each 20 dm3 that have flowed through, the following must be measured: 
– the alcohol temperature t1 at the input to the tested meter and alcohol temperature t2 in the 
filled reference graduated vessel (after stirring contents); both temperatures are recorded and 
sued to calculate median temperatures t1 and t2 ; 
– the apparent volume concentration of alcohol in  the filled reference graduated vessel (spirit 
gauge measurement). 
The following calculations must then be performed: 
– the true volume concentration of alcohol from the apparent concentration measured by the 
spirit gauge; 
– correction of data from the alcohol meter to the temperature of alcohol in the graduated vessel. 
In order to eliminate alcohol temperature changes,  the volume given by the meter display and the vol-
ume measured by the graduated vessels must be recalculated. 
Meter error in % is calculated as follows: 
 100.
22
21
1
VV V−
=ρρ
ε                                          
τ2VQ= 
where  V1 volume that has flowed through the meter in dm3; 
  V2 volume of alcohol determined by re ference graduated cylinders, in dm3; 
  ε measurement error of volume that has flow ed through the tested meter, in %; 
  ρ1 alcohol density at temperature t1, in kg/m3; 
  ρ2 alcohol density at temperature t2, in kg/m3; 
  Q flow rate, in dm3/min; 
  τ test time, in min. 
Measurement error ε must not be greater than values listed in Table 1 for the appropriate meter size. 
5.3.4    Volume test of individual drum measuring chambers 
The test is performed by pouring the chamber cont ents into a graduated cylinder or reference gradu-
ated vessel having a volume of: 
– 5 l for large-volume meters; 
– 1 l for small-volume meters. 
When the volume of individual drum chambers is be ing tested, the first tested chamber is measured 
once more after all other chambers have been testi ng. Its volume is determined from the second meas-
urement. 
The difference in volume of the largest and sma llest chamber must meet the provisions of section 
2.3.2.1. 
5.3.5   Resolution test 
Prior to the test, the entire drum must be pre-wetted and then put into such a position that the edge of 
one of the outflow openings is opposite the mark on the spirit gauge reservoir. Measure of a General Nature No. 0111-OOP-C008-10 
10 At a minimum flow rate of Qmin the drum must start moving before the alcohol begins to flow out of 
the outflow channel.  
The backup meter is tested in the same way. 
5.3.6   Backup measuring apparatus accuracy test 
The following must be checked prior to the test: 
– regular movement of the apparatus; 
– correct connection of the overflow groove; 
– correct engagement and movement of th e lever system and alarm functionality. 
A test of the accuracy of measurement the volume of  alcohol that has flowed through the backup drum 
is performed according to section 5.3.3 at a flow rate of (5 to 10) dm3/min.  
The error in measurement of the backup drum volum e must not be greater than the values listed in 
Table 1 for the relevant meter size. 
5.3.7    Structural element accuracy test 
5.3.7.1    Sampling apparatus accuracy test 
Determining volume errors of all sampling apparatus sets (ladles) is done during one drum rotation. 
The volume of alcohol sampled by n ladles, where n is the number of drum chambers, is captured for 
each sampling apparatus set in a graduated cylinder with a spout 
The error of n ladle volumes must meet the requirements of Section 2.3.2.2. 
5.3.7.2    Accuracy test of other structural elements 
Tests for correct collection, insertion and surge vessel volumes are performed after pre-wetting by 
measuring volume using graduated cylinders and pipettes. 
Volume errors of collection, insertion and surge vessel s must meet the requirements of Section 2.3.2.3. 
5.3.8    Display check 
The check consists of: 
– checking that gearing used (after removing pr otective covers) is in accordance with meter 
documentation; 
– checking that the block preventing the disp lay from being rolled back works properly. 
5.3.9   Conversion apparatus test 
If the alcohol meter has a built-in or auxiliary conve rsion apparatus, which uses alcoholometric tables 
or connected temperature and density sensors and pe rforms conversion of the volume of a mixture of 
ethanol and water to normal cond itions, conversion to mass, and calculates volume or mass concentra-
tions of ethanol, this conversion apparatus is tested  from the perspective of its functionality and form 
the perspective of storage of alcoholometri c table data in the conversion apparatus. 
If the conversion apparatus receives input from c onnected measuring devices, such as a thermometer 
or densitometer for correction or conversion of measur ed data, they must be included in the type ap-
proval of the alcohol meter.  
5.4    Tests of conversion apparatus resist ance to disruptive environmental influences  
Of the tests listed below, those that are relevant to the design and specified conditions of use of the 
conversion apparatus are performed. Measure of a General Nature No. 0111-OOP-C008-10 
11 5.4.1    Tests of resistance to climactic influences 
5.4.1.1    Limit temperatures test 
Resistance to ambient temperature limits is t ested with the conversion apparatus switched on: 
a) with dry heat at a temperature of 55 °C for 2 hours; 
b) with cold at a temperature of -10 °C or -25 °C (according to manufacturer requirements) for 2 
hours. 
After the specified time has passed, an accuracy test is performed at the given limit temperature at 
three points of the alcohol meter's measurement ra nge. Measurement errors must not exceed the great-
est permissible error according to Section 2.3.1. 
5.4.1.2    Humidity test 
Resistance to humidity is tested with the conversion apparatus switched off by cycling wet heat in two 
24 hr cycles at a maximum temperature of 55 °C and a relative humidity greater than 95 %. 
After both cycles have completed and restoration of operating conditions, m easurement errors must 
not exceed the maximum permissible error according to Section 2.3.1. 
5.4.2    Limit power voltages test 
Resistance to limit power voltage va lues are tested with the conversion apparatus switched on. For AC 
these limits are Unom – 15 % and Unom + 10 %, where Unom is the nominal power voltage. 
Measurement errors must not exceed the greatest perm issible error according to Section 2.3.1 at limit 
power voltage values. 
5.4.3    Electromagnetic compatibility (EMC) tests 
5.4.3.1    Resistance to short AC voltage dips , short interruptions, and slow voltage changes 
Resistance to short AC voltage gips, short interrupti ons and slow voltage changes are tested with the 
conversion apparatus switched on at all AC power inputs by applying a voltage dip: 
– of 100% of Unom for 0.5 of an AC voltage cycle; 
– of 100% of Unom for 1 AC voltage cycle; 
– of 20% of Unom for 25 AC voltage cycles. 
The test must be performed for at least one flow ra te, with simulated input signals being allowed. No 
serious errors may occur during this test. 
5.4.3.2    Resistance to rapid transient elect rical phenomena/impulse groups on power voltage 
Resistance to rapid transient electrical phenomena/ impulse groups is tested w ith the conversion appa-
ratus switched on at a test voltage of ± 1 kV on pow er terminals with at least 10 positive or negative 
randomly phased transient phenomena/impulse groups. 
The test must be performed for at least one flow ra te, with simulated input signals being allowed. No 
serious errors may occur during this test. 
5.4.3.3    Resistance to electrostatic discharge 
Resistance to electrostatic discharge  is tested with the conversion apparatus switched on, preferably 
with a contact discharge of 6 kV applied to a conduc tive section of the meter or with an 8 kV air dis-
charge applied to coupling plates near the meter. 
The test must be performed for at least one flow ra te, with simulated input signals being allowed. No 
serious errors may occur during this test. Measure of a General Nature No. 0111-OOP-C008-10 
12 5.4.3.4    Resistance to rapid transient electri cal phenomena/impulse groups on signal, data and 
control wiring 
Resistance to rapid transient electrical phenomena/ impulse groups is tested w ith the conversion appa-
ratus switched on at a test voltage of ± 0.5 kV on signal terminals with a repeat frequency of 5 kHz. 
Interference is applied to all meter inputs and outputs. 
The test must be performed for at least one flow ra te, with simulated input signals being allowed. No 
serious errors may occur during this test. 
5.4.3.5    Resistance to electrical shocks on signal, data and control wiring 
Resistance to shock impulses is t ested with the conversion apparatu s switched on by applying at least 
three positive and three negative voltage shocks: 
– asymmetrical line for line – line 0.5 kV; 
– asymmetrical line for line – ground 1.0 kV; 
– symmetrical line for line – ground 1.0 kV. 
The test must be performed for at least one flow ra te, with simulated input signals being allowed. No 
serious errors may occur during this test. 
5.4.3.6    Resistance to shock impulses on power voltage 
Interference is composed of three positive and th ree negative voltage impulses. For AC, pulses must 
be applied synchronously with AC power for phase shifts of 0° , 90°, 180° and 270°. Voltage ampli-
tude is 1.0 kV for line – line and 2.0 kV for line – ground. 
The test must be performed for at least one flow ra te, with simulated input signals being allowed. No 
serious errors may occur during this test. 
5.4.3.7    Resistance to a radiated high-frequency electromagnetic field 
Resistance to a radiated high-frequency electromagnetic  field is tested with the conversion apparatus 
switched on. The conversion apparatu s is subjected to an electromagne tic field in the 80 MHz to 2 
GHz frequency range with test field intensity amp litude of 3 V/m and 80% amplitude modulation with 
a 1 kHz sinus wave. 
The test must be performed for at least one flow ra te, with simulated input signals being allowed. No 
serious errors may occur during this test. 
5.4.3.8    Resistance to interference caused by power lines, induced by high-frequency fields 
Resistance to interference caused by power lines, induced by high-frequenc y fields is tested with the 
conversion apparatus switched on, be tween a frequency range of 150 kHz to 80 MHz at a test voltage 
of 3 V. Interference is applied to a ll inputs and outputs and to meter power. 
The test must be performed for at least one flow ra te, with simulated input signals being allowed. No 
serious errors may occur during this test. 
6   Initial verification 
6.1   In general 
The initial verification process for an alcohol meter includes the following tests: 
a) visual inspection; 
b) functional tests. Measure of a General Nature No. 0111-OOP-C008-10 
13 6.2   Visual inspection 
The following is assessed during a visual  inspection of an alcohol meter: 
whether the meter submitted for verification and its components correspond to the approved type, and 
whether they are not physically damaged, 
a) whether the meter and its components are satisf actory from the perspective of functionality 
and integrity: 
– the housing, especially at its seams, is whole and functional and does not bear signs of ex-
ternal interference with the meter; 
– the position and connection of counters corresponds  to the approved type, bear no signs of 
external interference, and their function and recording exhibits no apparent difficulties; 
– the surface and seams of drums, ladles and all vessels exhibit no signs of leakage and po-
rosity; 
– collection and insertion vessels and collection vessel taps exhibit no signs of leakage; 
– position marks are correctly set; 
– the meter has been installed accord ing to manufacturer instructions. 
6.3   Functional tests 
6.3.1   Test equipment 
Appropriate test equipment as per Section 5.3.1 is used. 
6.3.2   Leak test 
A drum leak test is performed for new and re paired meters according to Section 5.3.2. 
If a leak is found, no further tests are performed on the meter. 
6.3.3   Accuracy test 
A meter accuracy test is performed according to Section 5.3.3. 
The measurement error must not exceed the values li sted in Table 1 for the relevant meter size. 
6.3.4    Volume test for individual drum measurement chambers 
A volume test for individual drum measurement cham bers is performed according to Section 5.3.4. 
The difference in volume between the largest and smallest chambers must meet the provisions of Sec-
tion 2.3.2.1. 
6.3.5   Resolution test 
A resolution test is performed according to Section 5.3.5. 
6.3.6    Backup measuring apparatus accuracy test 
A resolution test is performed according to Section 5.3.6. 
The measurement error for the backup drum must not  exceed the values listed in Table 1 for the rele-
vant meter size. 
6.3.7    Structural element accuracy tests 
Structural element accuracy tests are performed according to Section 5.3.7. Measure of a General Nature No. 0111-OOP-C008-10 
14 6.3.8   Display check 
The check consists of: 
– checking that gearing used (after removing pr otective covers) is in accordance with meter 
documentation; 
– checking that the block preventing the disp lay from being rolled back works properly. 
6.4   Conversion apparatus test 
If the alcohol meter has a built-in or auxiliary conver sion apparatus, this convers ion apparatus is tested 
from the perspective of its functionality and form th e perspective of storage of alcoholometric table 
data in the conversion apparatus. 
If the conversion apparatus receives input from c onnected measuring devices, such as a thermometer 
or densitometer for correction or c onversion of measured data, they ar e subject to initial verification as 
part of the conversion apparatus. 
6.5   Test assessment 
If the meter passed all test requirements, official labe ls are placed on the meter on locations stipulated 
in the type approval certificate, and a veri fication sheet is issued for the meter. 
7   Subsequent verification 
7.1   In general 
The subsequent verification process for an al cohol meter includes the following tests: 
b) visual inspection; 
c) functional tests. 
7.2   Visual inspection 
During subsequent verification, visual inspec tion is performed according to Section 6.2. 
7.3   Functional tests 7.3.1   Test equipment 
Appropriate test equipment accord ing to Section 5.3.1 is used. 
7.3.2   Leak test 
A drum leak test is performed according to Section 5.3.2. If a leak is found, no further tests are performed on the meter. 
7.3.3   Accuracy test 
A meter accuracy test is performed according to Section 5.3.3. 
The measurement error must not exceed the values li sted in Table 1 for the relevant meter size. 
7.3.4   Display check 
The check consists of checking that the block pr eventing the display from being rolled back works 
properly. 
7.4   Conversion apparatus test 
During subsequent verification, the conversion a pparatus is tested according to Section 6.4. Measure of a General Nature No. 0111-OOP-C008-10 
15 7.5   Test assessment 
If the meter passed all test requirements, official labe ls are placed on the meter on locations stipulated 
in the type approval certificate, and a veri fication sheet is issued for the meter. 
8   Notified standards 
To specify metrological and technical requirements for measuring devices and to specify verification 
test methods stemming from this measure of a gene ral nature, the CMI notifies Czech technical stan-
dards, other technical standards or technical documen ts of international or foreign organizations or 
other technical documents containing detailed tec hnical requirements (hereinafter "notified stan-
dards"). The CMI shall publish a list of these notifie d standards, with their assignation to relevant 
measures, along with the measure of a general nature , in a manner available to the public (on the web-
site www.cmi.cz). 
Compliance with notified standards or parts thereof is considered, to the extent and under the condi-
tions stipulated by a measure of a general nature, to be compliance with those requirements stipulated 
by this measure to which these standards or parts thereof apply. 
  
II. 
J U S T I F I C A T I O N  
The CMI issues, towards the implementation of Section 24c of Act No. 505/1990 Coll., on metrology, 
as amended, this measure of a ge neral nature stipulating metrological and technical requirements for 
specified measuring devices and test methods for verification of these specified measuring devices. 
In Decree No. 345/2002 Coll., specifying measuring devices for mandatory verification and measuring 
devices subject to type approval, as amended, the annex "List of Specified Measuring Device Types" 
classifies alcohol meters used to measure the amount of alcohol produced under item 1.3.8 as measur-
ing devices subject to type approval and verification. 
The CMI thus issues, towards the implementation of Section 24c of Act No. 505/1990 Coll., on me-
trology, as amended, for the measuring device type specified as "alcohol meters used to measure the 
volume of alcohol produced", this measure of a ge neral nature, stipulating metrological and technical 
requirements for alcohol meters used to measure th e volume of alcohol produced and test methods for 
type approval and verification of these specified measuring devices. 
  Measure of a General Nature No. 0111-OOP-C008-10 
16 III. 
E F F E C T I V E  D A T E  
This measure of a general nature takes effect on th e fifteenth day following the day of its publication 
(Section 24d of Act No. 505/1990 Coll., on metrology, as amended).